March 14, 2014 Subject:
The more things change, the more they stay the same...
This 1961 video (16mm film) from the Dept of Defense does an excellent job explaining the difference between single-phase and 3-phase power. It even discusses 2-phase power used in radar. Although it got a little too deep for my purposes towards the end, this is a great teaching tool. The visuals are still accurate today, albeit they are in B&W.